package com.one.rope.mvp.basecore.util;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

import java.util.HashSet;
import java.util.Set;

/**
 * 拷贝属性忽略空值
 *
 * @author
 */
public class MyBeanUtils {

  public static String[] getNullPropertyNames(Object source) {
    final BeanWrapper src = new BeanWrapperImpl(source);
    java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();

    Set<String> emptyNames = new HashSet<>();
    for (java.beans.PropertyDescriptor pd : pds) {
      Object srcValue = src.getPropertyValue(pd.getName());
      if (srcValue == null) {
        emptyNames.add(pd.getName());
      }
    }
    String[] result = new String[emptyNames.size()];
    return emptyNames.toArray(result);
  }

  public static void copyPropertiesIgnoreNull(Object src, Object target) {
    BeanUtils.copyProperties(src, target, getNullPropertyNames(src));
  }

}
